The Westminster Confession of Faith

Westminster Assembly

Produced by the Westminster Assembly for the great Parliament, this time-honored treasure of the faith bears striking resemblance to the Irish Articles, but is far abler, fuller, and superior to any of its predecessors, and gives proof that the Assembly was steadily dominated by its aim to state nothing therein which is not expressly taught in the Word of God, or derivable therefrom by good and necessary reference.

Section 4

4. Marriage ought not to be within the degrees of consanguinity or affinity forbidden by the Word. (Lev. 18, 1 Cor. 5:1, Amos 2:7) Nor can such incestuous marriage ever be made by any law of man or consent of parties, so as those persons may live together as man and wife. (Mark 6:18, Lev. 18:24–28)